With PC off, internet works great via phone, but with PC on, internet is mostly off with DSL light on modem blinking.Occasionally the net will come on, but usually only for a few a finds at a time.

This is a highly variable/intermittent problem.... It first happened a few months ago at my parents house but then went away. Everything has been normal at my house until a couple days ago it was having some troubles, but was working normally again through last night. Then the problem is back again today all day.

It's def on WiFi. I have no cell coverage here. So this morning the problem has magically disappeared again... I'm starting to think the transformer on my power cord may occasionally create an emf which disrupts the router... Although I don't know how likely that is..

This is the wierdest computer problem I've ever had. Spent an entire day on phone with tech support and had a cl guy come out and nobody can figure it out. It's def something with my computer though and they only look at the router side of it...